loop0: detected capacity change from 0 to 1024
EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2809!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5316 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:ext4_do_writepages+0x4607/0x4610 fs/ext4/inode.c:2808
Code: c6 a0 b7 7e 8b e8 79 a2 af fe 90 0f 0b e8 01 ca 47 ff 4c 89 f7 48 c7 c6 80 bb 7e 8b e8 62 a2 af fe 90 0f 0b e8 ea c9 47 ff 90 <0f> 0b 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000fd274a0 EFLAGS: 00010293
RAX: ffffffff82784c46 RBX: 0000006210000000 RCX: ffff888000e04900
RDX: 0000000000000000 RSI: 0000004000000000 RDI: 0000000000000000
RBP: ffffc9000fd278d0 R08: ffff8880520f9377 R09: 1ffff1100a41f26e
R10: dffffc0000000000 R11: ffffed100a41f26f R12: 0000000000000001
R13: ffffc9000fd27920 R14: 0000004000000000 R15: dffffc0000000000
FS:  00007fe67209a6c0(0000) GS:ffff88808d730000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000005f48 CR3: 0000000042ca2000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ext4_writepages+0x205/0x350 fs/ext4/inode.c:3025
 do_writepages+0x32e/0x550 mm/page-writeback.c:2604
 filemap_fdatawrite_wbc mm/filemap.c:389 [inline]
 __filemap_fdatawrite_range+0x1ab/0x260 mm/filemap.c:422
 generic_fadvise+0x4ec/0x710 mm/fadvise.c:114
 vfs_fadvise mm/fadvise.c:185 [inline]
 ksys_fadvise64_64 mm/fadvise.c:198 [inline]
 __do_sys_fadvise64 mm/fadvise.c:210 [inline]
 __se_sys_fadvise64 mm/fadvise.c:208 [inline]
 __x64_sys_fadvise64+0x143/0x190 mm/fadvise.c:208
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe67118f6c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe67209a038 EFLAGS: 00000246 ORIG_RAX: 00000000000000dd
RAX: ffffffffffffffda RBX: 00007fe6713e5fa0 RCX: 00007fe67118f6c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 00007fe671211f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe6713e6038 R14: 00007fe6713e5fa0 R15: 00007fff67f527e8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_do_writepages+0x4607/0x4610 fs/ext4/inode.c:2808
Code: c6 a0 b7 7e 8b e8 79 a2 af fe 90 0f 0b e8 01 ca 47 ff 4c 89 f7 48 c7 c6 80 bb 7e 8b e8 62 a2 af fe 90 0f 0b e8 ea c9 47 ff 90 <0f> 0b 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90
RSP: 0018:ffffc9000fd274a0 EFLAGS: 00010293
RAX: ffffffff82784c46 RBX: 0000006210000000 RCX: ffff888000e04900
RDX: 0000000000000000 RSI: 0000004000000000 RDI: 0000000000000000
RBP: ffffc9000fd278d0 R08: ffff8880520f9377 R09: 1ffff1100a41f26e
R10: dffffc0000000000 R11: ffffed100a41f26f R12: 0000000000000001
R13: ffffc9000fd27920 R14: 0000004000000000 R15: dffffc0000000000
FS:  00007fe67209a6c0(0000) GS:ffff88808d730000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000005f48 CR3: 0000000042ca2000 CR4: 0000000000352ef0